Sealing bubble to seal off channel pipe section lies against piping sides when inflated; is connected to half-shells which pick the bubble up when collapsed and part when bubble is inflated

摘要

Sealing bubble is made of flexible material and when inflated lies against the sides of the pipe to seal them. The bubble is collapsible and is connected securely at both ends to an oval or ball-shaped half-shell (1,2). The half-shells pick up the bubble (4) between them in its collapsed state when the housing is closed and part from each other when the bubble is inflated.